Abstract
It has been shown that 1-aryl-8-(4-bromophenyl)-4,6-dioxo-2H(phenyl)-7-phenyl-1,4,6,7,8,9-hexahydropyrimido[4,5-b][1,6]naphthyridines are formed on heating anilides of 1-aryl-7-(4-bromostyryl)-4-oxo-1,4-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acids in PPA.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, 597–600, April, 2005.
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Deyanov, A.B., Konshin, M.E. Synthesis of Derivatives of 4,6-Dioxo-1,4,6,7,8,9-hexahydropyrimido[4,5-b][1,6]naphthyridines. Chem Heterocycl Compd 41, 511–514 (2005). https://doi.org/10.1007/s10593-005-0180-x
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DOI: https://doi.org/10.1007/s10593-005-0180-x